Physics Letters A
Physics Letters A > 2012 > 377 > 1-2 > 83-92
Physics Letters A > 2012 > 377 > 1-2 > 1-6
Physics Letters A > 2012 > 377 > 1-2 > 93-98
Physics Letters A > 2012 > 377 > 1-2 > 13-17
Physics Letters A > 2012 > 377 > 1-2 > 7-8